40 free calculators. Where a provision governs what the calculator does, it is named here — in the 1961 numbering your notice uses and the 2025 numbering the new Act uses — and linked to the case law on it. Work out the figure, then read what the courts have said about the provision it came from.
— what a cost-to-company figure becomes in the hand after the standard deduction and the two regimes.
— how much of the house rent allowance is exempt, on the actual rent, salary and city.
— the value of a car, rent-free accommodation and the other perquisites under Rule 3.
— the perquisite on exercise and the capital gain on sale, kept apart as the Act keeps them.
— relief under section 89 when arrears bunch into one year, with the Form 10E working.
— the exemption under section 10(10).
— the section 2(y) add-back under the Code on Wages, and what it does to PF, EPS, gratuity and take-home.
— the gain on a sale, with the holding period, the indexation choice and the rate that applies.
— how much of the gain the reinvestment actually shelters, and by when it must be made.
— the interest and principal relief across sections 24(b), 80C, 80EE and 80EEA.
— the presumptive profit, the 6 per cent digital rate, and the point at which books become compulsory.
— the presumptive profit for a profession and the receipts limit.
— turnover for section 44AB and whether the loss is speculative.
— break-even units and revenue, contribution margin, margin of safety and the days to reach it.
— the one per cent under section 194-IA and the Form 26QB that carries it.
— the collection under section 206C(1G) on a foreign remittance or tour package.
— the four instalments, and the shortfall each one leaves behind.
— the interest a late return or a short instalment carries, month by month.
— the flat charge under section 115BBH, with no set-off of losses and no expenditure.
— resident, not ordinarily resident or non-resident, counted on the days actually in India.
— what a Hindu undivided family saves, and where section 64(2) claws it back.
— when a gift is taxed under section 56(2)(x) and which relatives fall outside it.
— the medical insurance deduction, with the senior-citizen and preventive-checkup limits.
— the deduction under section 80CCD, including the employer's share.
— the maturity value, and the deduction the contribution earns.
— the 8.33 per cent diverted to EPS, the running-balance interest, and the Rule 9D test on interest above 2.5 lakh.
— 8.2 per cent over fifteen years of deposits to a twenty-one year maturity, and the deduction each deposit earns.
— inflation-adjusted expenses, 25x and 30x sizing, a drawdown model and the monthly amount that closes the gap.
— quarterly compounding, the real post-tax yield, and the threshold at which the bank starts deducting.
— each instalment compounded separately, with the deduction aggregated across your deposits.
— the instalment on a home, car or personal loan, the amortisation, and what sections 24(b) and 80C take off it.
— a step-up SIP with the tax on exit applied, the real value after inflation, and a drawdown preview.
— what raising the instalment each year adds over a flat SIP, with the gain on exit taxed.
— one-time growth at a real post-tax return, for equity and for debt bought after April 2023.
— monthly against annual compounding, set beside simple interest, in today's money.
— CAGR for a lumpsum, XIRR for irregular flows, and why CAGR overstates what a SIP returned.
— the four-slab GST 2.0 structure, inclusive or exclusive, with the CGST and SGST split.
— the section 47 late fee and the section 50 interest on a late GSTR-1, 3B, 9 or 10 — the CGST Act, not this one.
— the tax under the old and the new regime, side by side.